表面形貌对燃料电池密封件接触特性的影响  

Influence of Surface Morphology on Contact Characteristics of Fuel Cell Seals

作　　者：张文超 卜庆元 李艳昆 吕宝 ZHANG Wenchao;BU Qingyuan;LI Yankun;LV Bao(CRRC Qingdao Sifang Locomotive&Rolling Stock Co.,Ltd.,Qingdao Shandong 266111,China;Guangdong SinoSynergy Hydrogen Power Technology Co.,Ltd.,Yunfu Guangdong 527300,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司,山东青岛266111 [2]广东国鸿氢能科技有限公司,广东云浮527300 [3]北京理工大学重庆创新中心,重庆401120

出　　处：《润滑与密封》2022年第8期134-140,共7页Lubrication Engineering

基　　金：重庆市自然科学基金项目(cstc2020jcyj-msxmX0759)。

摘　　要：为探究燃料电池密封件表面形貌对密封接触特性的影响,采用Weierstrass-Mandelbrot分形函数表征密封件的表面形貌,基于Majumdar-Bhushan接触模型构建考虑密封件表面形貌的二维有限元模型。研究接触—一次线性加载—卸载—二次线性加载4个步骤下光滑表面与粗糙表面的接触特性,基于上述模型,研究材料硬度对燃料电池密封性能的影响。研究结果表明:粗糙表面二次加载后其应力分布均匀度低于第一次,且其2次加载后应力分布均匀度均低于光滑表面;粗糙表面二次加载后其最高应力与最大接触压力较第一次分别增加14.29%与89.29%,而光滑表面几乎维持不变;对于粗糙表面,其硬度越高,泄漏率越低,且其降低幅度随硬度增大而减小。In order to explore the influence of the surface morphology of the fuel cell seal on the sealing performance,the Weierstrass-Mandelbrot fractal function was used to characterize the rough surface morphology of the seal,and a twodimensional finite element model considering the surface morphology of the seal was established based on the Majumdar-Bhushan contact model.The contact characteristics of the smooth surface and the rough surface under the four steps of contact,primary linear loading,unloading and secondary linear loading were studied,and the influence of material hardness of fuel cell seals on the sealing performance was further explored.The results show that the uniformity of stress distribution of the rough surface after second loading is lower than that of the first time,and the uniformity of stress distribution of two times loading are lower than that of the smooth surface.Compared with primary loading,the maximum stress and contact pressure of the rough surface after second loading increases 14.29% and 89.29%,respectively.While the maximum stress and contact pressure of the smooth surface remains almost unchanged.The higher the hardness of the rough surface,the lower the leakage rate,and the reduction rate of the leakage rate decreases with the increasing of hardness.

关 键 词：质子交换膜燃料电池 W-M分形函数 泄漏率 表面形貌 粗糙度 

分 类 号：TM911.4[电气工程—电力电子与电力传动]